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钻具螺纹相控阵超声检测方法研究

Research on phased array ultrasonic testing method for drilling tool threads

  • 摘要: 在石油与天然气开采中起到重要作用的石油钻具,长期受到交变载荷作用,而钻具螺纹由于结构刚度远小于钻具本体,极易发生疲劳失效。为克服常规超声对于钻具螺纹根部裂纹检测能力低的问题,本文提出了基于相控阵超声的钻具螺纹新型超声检测方法。建立了钻具螺纹的超声检测有限元数值计算模型,通过数值模拟分别研究了扇形扫查相控阵超声和全聚焦相控阵超声对于钻具螺纹根部裂纹的检测能力,优化了其检测参数,并对两种相控阵超声检测方法检测结果进行了比较,最后通过实验进行了验证,证明了所提方法的有效性。

     

    Abstract: Petroleum drilling tools play an important role in oil and gas extraction and are subjected to alternating loads for a long time. However, due to their much smaller structural stiffness compared with the drilling tool itself, the threads of the drilling tools are prone to fatigue failure. To overcome the problem of the low detection ability of conventional ultrasound for root cracks in drilling tool threads, this paper proposes a new ultrasonic detection method for drilling tool threads based on phased array ultrasound. A finite element numerical calculation model for ultrasonic testing of drilling tool threads was established, and the detection capabilities of fan-shaped scanning phased array ultrasound and fully focused phased array ultrasound for root cracks of drilling tool threads were studied through numerical simulation. The detection parameters were optimized, and the detection results of the two phased array ultrasonic testing methods were compared. Finally, the effectiveness of the proposed method was verified through experiments.

     

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